The equilibrium adsorption experiment on phosphorus for sediment colonized by biofilm.

Huiming Zhao, Hongwei Fang, Yishan Chen, Yuefeng Zhang, Chunqing Chi

Monday 29 june 2015

17:57 - 18:00h at Europe 1 & 2 (level 0)

Themes: (T) Hydro-environment, (ST) Ecohydraulics and ecohydrology, Poster pitches

Parallel session: Poster pitch: 3G. Environment - Ecohydraulic

Biofilm secreted by the metabolic activities of microorganism is known to have a great impact on the geochemical and biological characteristics of sediment particles and its environmental effects in hydro-environment system, yet little effort has been made to study the considerable variability in the pollutants adsorption process of sediment particles caused by the growth of biofilm. Understanding the changes associated with biofilm growth and quantifying the parameters scale over which these changes occur is important for developing suitable associated experimental designs and for understanding how biofilm mediate sediment properties and environmental factors. This paper takes the phosphorus pollutants as adsorbent and studies the influence of biofilm on pollutants adsorption of sediment particles. The isothermal equilibrium adsorption experiment of sediment without and with biofilm for different growth time on phosphorus are carried out and Langmuir adsorption isotherm is adopted to analyze the adsorption rule of biological sediment on pollutants under the impact of biofilm. It provides the first evidence for the interaction of sediment particles, biofilm and pollutants. The results show that the phosphorus adsorption capacity of sediment particles increase with the growth of biofilm.